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(/ (- (car p) (car O)) (- (car u) (car O)) )
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(/ (- (cadr p) (cadr O)) (- (cadr u) (cadr O)) )
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(define u (getCoordinates a2))
(define p (getCoordinates a3))
(/ (- (car p) (car O)) (- (car u) (car O)) )

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(define u (getCoordinates a2))
(define p (getCoordinates a3))
(/ (- (cadr p) (cadr O)) (- (cadr u) (cadr O)) )</code></script></drgeo></drgenius>

